WPF Performance
When I was at DDS a nice chap asked me if I knew about WPF performance and the answer was no but I did do some digging and just for the record this is what I found , comments welcome.
Perf in WPF
http://msdn.microsoft.com/en-us/library/aa970683.aspx
Perf tools for WPF
http://msdn.microsoft.com/en-us/library/aa969767.aspx
the most important bit could be .NET 3.5 SP1
http://blogs.msdn.com/jgoldb/default.aspx
you need to make sure that the problem is not poor code performance ( your code )
http://blogs.msdn.com/timothyc/archive/2006/02/28/540291.aspx
b.